CN103614506B - A kind of converter steel making method using little grade high basicity sinter - Google Patents
A kind of converter steel making method using little grade high basicity sinter Download PDFInfo
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- CN103614506B CN103614506B CN201310623631.4A CN201310623631A CN103614506B CN 103614506 B CN103614506 B CN 103614506B CN 201310623631 A CN201310623631 A CN 201310623631A CN 103614506 B CN103614506 B CN 103614506B
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Abstract
The invention discloses a kind of converter steel making method using little grade high basicity sinter, comprise the following steps: in converter, add steel scrap, molten iron; In stove, be blown into gas, blowing is lighted a fire successfully, and the high basicity sinter that will be 2 ~ 3 successively by lime, light dolomite, magnesite ball and granularity 3mm ~ 5mm, basicity by high hopper joins in converter; Stop when molten steel terminal composition and temperature reach requirement blowing; The stove that falls makes molten steel flow in ladle, adds reductor; Casting molten steel.High basicity sinter has the trend of oxygenation, can use, can cool molten bath as solubility promoter after heat reduction, and the tiny body of agglomerate is light, is thus easy to float in slag, can increase the content of ferric oxide in slag, improve blowingization slag condition, being conducive to slag; Can metal recovery rate be improved, reduce the consumption of oxygen, reduce steelworks steel technology, reduce production cost.The basicity of sinter return fine and content of MgO, all higher than iron ore, can better protect furnace lining, effectively can improve converter lining life.
Description
Technical field
The present invention relates to metallurgical technology field, be specifically related to a kind of converter steel making method.
Background technology
Converter steelmaking is with molten iron, steel scrap, iron alloy for main raw material, produces heat and complete steelmaking process by chemical reaction between the physical thermal of iron liquid self and iron fluid component in converter.
According to heat calculation, converter steelmaking heat is more than needed, and for meeting smelting requirements, converter usually uses steel scrap as main refrigerant in smelting process, carries out fine setting cooling with iron ore to converter temperature.The main component of iron ore is Fe
2o
3, Fe
3o
4, iron ore after being melted down iron is reduced, and process absorbs heat, thus can play the effect regulating bath temperature, but hardly containing CaO in iron ore, basicity is less, partially acidic gangue can cause the basic solvents such as lime to increase, the quantity of slag increases, and iron loss increases, and lining erosion aggravates.Ore fragmentation is large, and it is slower unfavorable to change slag to melt.
Patent CN101857911 provides a kind of method of converter steelmaking, comprises the following steps: will return mine and join in described converter, and be blended into molten iron; Gas spray gun is inserted in converter and blows; Add slag making materials; Stop blowing when the temperature of molten steel and composition reach requirement; Molten steel in converter is flowed in ladle, and add reductor in ladle.There is the problems such as ignition difficulties, the quantity of slag is large, metal recovery rate is low in the method.
In blast furnace ironmaking process, the small sinter being less than 5mm is all turn back to sintering plant again to sinter as the part of raw materials for sintering usually, and be unfavorable for that sintering process is carried out on the one hand, the quality of agglomerate is affected; The utilization ratio of sinter machine is not high on the other hand, not only improves energy consumption, metallogenic ratio is affected, and production capacity reduces, and sintering circuit cost raises.But FeO content, about 9%, has epigranular, piles up that porosity is large, intensity is high, the feature of good stability in small sinter, how at utmost to recycle and improve metal recovery rate, expanding steel-making, to fall this space be have problem to be solved.
For making up the deficiencies in the prior art, solving Problems existing, being badly in need of one and being easy to dissolvingization slag, by improving blowingization slag condition, improving metal recovery rate and the converter steel making method that can reduce costs.
Summary of the invention
The present invention is directed to the problem and shortage of prior art, provide the converter steel making method that a kind of small grain size high basicity sinter replaces high-quality rawore, to improve blowingization slag condition, improve metal recovery rate and can reduce costs.
The method is achieved in that
Use a converter steel making method for little grade high basicity sinter, comprise the following steps: in converter, add steel scrap, molten iron; Gas is blown into, blowing igniting in stove; Add slag material; Stop oxygen blast; The stove that falls makes molten steel flow in ladle, adds reductor; Pour Steel, is characterized in that, containing the little grade high basicity sinter of granularity at below 5mm in slag material.Grade is preferably 3mm-5mm.In converter, first add steel scrap be blended into molten iron again, in stove, be blown into oxygen and nitrogen, or oxygen and argon gas.Oxygen is blown in stove by converter top oxygen gun, and nitrogen or argon gas are blown in stove by gas permeable brick arm bottom converter.
Blowing is lighted a fire successfully, joins in converter by high hopper by slag material, adds in blowing 10min.
The basicity of high basicity sinter is 2 ~ 3, and add-on is 4 ~ 12kg/t.Slag material also has lime, light dolomite, magnesite ball except high basicity sinter, and the order added is lime, light dolomite, magnesite ball and high basicity sinter, accounts for 60 ~ 70% of total slag charge, 10 ~ 30%, 0 ~ 10% and 7 ~ 16% respectively.
Smelt the terminal component requirements of steel grade when molten steel terminal composition reaches, when temperature reaches this tapping temperature required by smelting steel grade, stop oxygen blast immediately.
Reductor is iron alloy, can be ferromanganese, silicomanganese, Si-Ca-Ba, ferro-aluminum or ferrosilicon.
Present method has following advantage:
1, FeO Content in Sinter reaches about 9%, and iron ore main component is Fe2O3, Fe3O4, the tiny body of agglomerate is light, thus be easy to float in slag, the content of ferric oxide in slag can be increased, improve blowingization slag condition, being conducive to slag, the morning 1min of first slag formation time ratio iron ore, early can change slag, be conducive to dephosphorization;
2, high basicity sinter has the trend of oxygenation, can use, can cool molten bath as solubility promoter after heat reduction, can metal recovery rate be improved, the consumption of oxygen can be reduced, the oxygen supply time of single stove is reduced, faster production rhythm, enhances productivity further;
3, the high-quality rawore using the high basicity sinter being greater than 3mm in BF return fines to replace steel-making to use, can vitalize resource, turn waste into wealth, and comparatively high-quality lump ore is low for small sinter price simultaneously, can reduce production cost;
4, because the cooling-down effect of sinter return fine and iron ore is 3:2, so the amount ratio iron ore of sinter return fine is large, more metal charge can be brought, improve the rate of recovery of metal, greatly reduce steelworks steel technology;
5, agglomerate not only plays the effect of refrigerant in converter steelmaking process, can also play the effect of solubility promoter;
6, the basicity of sinter return fine and content of MgO are all higher than iron ore, can better protect furnace lining, effectively can improve converter lining life.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of the converter steel making method of the little grade high basicity sinter of use of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated, but limited the present invention never in any form, and any conversion done based on training centre of the present invention or improvement, all fall into protection scope of the present invention.
As shown in Figure 1, a kind of converter steel making method using little grade high basicity sinter of the present invention, comprises the following steps:
1, in converter, steel scrap, molten iron is added;
2, in stove, gas is blown into, blowing igniting;
3, slag material is added;
4, stop blowing;
5, the stove that falls makes molten steel flow in ladle, adds reductor;
6, casting molten steel.
Containing the little grade high basicity sinter of granularity at below 5mm in slag material.
The described gas be blown in stove is oxygen and nitrogen, or oxygen and argon gas.
The basicity of described high basicity sinter is 2 ~ 3, and blowing is lighted a fire successfully, joins in converter by high hopper by high basicity sinter, and add in blowing 10min, the add-on of described high basicity sinter is below 13kg/t.
Described slag material also has lime, light dolomite, magnesite ball except high basicity sinter, and the order added is lime, light dolomite, magnesite ball and high basicity sinter, accounts for 60 ~ 70% of total slag charge, 10 ~ 30%, 0 ~ 10% and 7 ~ 16% respectively.
When molten steel terminal composition reaches the end point requirements smelting steel grade, when temperature reaches the tapping temperature of this smelting steel grade, stop oxygen blast immediately.
Described reductor is iron alloy, can be ferromanganese, silicomanganese, Si-Ca-Ba, ferro-aluminum or ferrosilicon.
As optimal way: the grade of described little grade high basicity sinter is 3mm-5mm.
Embodiment 1
Adopt 120t top and bottom combined blown converter blowing HRB400E steel grade, steel scrap hot metal charging is more first added in converter, total Intake Quantity is 134t, and the temperature of molten iron is 1290 DEG C, and its element weight percent is C:4.170%, Si:0.310%, Mn:0.560%, S:0.018%, P:0.159%.Then (purity>=99.5% of oxygen, oxygen supply pressure is 0.86MPa, and oxygen flow is 27000m in stove, to be blown into oxygen by converter top oxygen gun
3/ h), be blown into nitrogen bottom converter, light a fire successfully, first adding by high hopper the lime, the light dolomite of 16%, the magnesite ball of 8% and 16% grade that account for total slag charge 60% is 3mm
~4mm, basicity are the high basicity sinter (add-on is 11kg/t) of 2, and during blowing 4min, fire door flame feels like jelly, adduction, judges that first slag is formed thus, and by rifle position and slag charge access control, blowing is steadily normal, and slag charge " adds in blowing 9 ' 50.Omnidistance oxygen supply duration of blast reaches 15 ' 54 " after stop blowing, propose rifle deslagging, molten steel flowed in ladle, add ferromanganese, casting molten steel.After finishing blowing, the element weight percent of molten steel is C:0.07%, P:0.023%, and liquid steel temperature is 1658 DEG C.Molten steel amount is 122.34t, and blow loss is 8.7%.
Embodiment 2
Adopt 120t top and bottom combined blown converter blowing Q235B steel grade, steel scrap hot metal charging is more first added in converter, Intake Quantity is 132t, and the temperature of molten iron is 1305 DEG C, and its element weight percent is C:4.250%, Si:0.470%, Mn:0.530%, S:0.024%, P:0.175%.Then (purity>=99.5% of oxygen, oxygen supply pressure is 0.86MPa, and oxygen flow is 27000m in stove, to be blown into oxygen by converter top oxygen gun
3/ h), argon gas is blown into bottom converter, light a fire successfully, by high hopper first add account for total lime of slag charge 61%, the light dolomite of 30% and 9% high basicity sinter (add-on is 8kg/t), blowing 4.5min time, fire door flame feels like jelly, adduction, judge that first slag is formed thus, by rifle position and slag charge access control, blowing is steadily normal, and slag charge " adds in blowing 9 ' 45.Omnidistance oxygen supply duration of blast reaches 15 ' 57 " after stop blowing, propose rifle deslagging, molten steel flowed in ladle, add silicomanganese, casting molten steel.After finishing blowing, the element weight percent of molten steel is C:0.08%, P:0.020%, and liquid steel temperature is 1664 DEG C.Molten steel amount is 120.64t, and blow loss is 8.6%.
Embodiment 3
Adopt 120t top and bottom combined blown converter blowing HRB500E steel grade, steel scrap hot metal charging is more first added in converter, Intake Quantity is 135t, and the temperature of molten iron is 1280 DEG C, and its element weight percent is C:4.330%, Si:0.420%, Mn:0.590%, S:0.018%, P:0.203%.Then (purity>=99.5% of oxygen, oxygen supply pressure is 0.86MPa, and oxygen flow is 27000m in stove, to be blown into oxygen by converter top oxygen gun
3/ h), be blown into nitrogen bottom converter, light a fire successfully, by high hopper first add account for total slag charge 68% lime, the light dolomite of 16%, the magnesite ball of 5% and 11% grade be 4mm
~5mm, basicity are the high basicity sinter (add-on is 12kg/t) of 2.5, and during blowing 4.5min, fire door flame feels like jelly, adduction, judge that first slag is formed thus, by rifle position and slag charge access control, blowing is steadily normal, and slag charge " adds in blowing 9 ' 20.Omnidistance oxygen supply duration of blast reaches 16 ' 10 " after stop blowing, propose rifle deslagging, molten steel flowed in ladle, adds Si-Ca-Ba, casting molten steel.After finishing blowing, the element weight percent of molten steel is C:0.09%, P:0.019%, and liquid steel temperature is 1670 DEG C.Molten steel amount is 123.12t, and blow loss is 8.8%.
Embodiment 4
Adopt 120t top and bottom combined blown converter blowing HRB400E steel grade, steel scrap hot metal charging is more first added in converter, Intake Quantity is 130t, and the temperature of molten iron is 1320 DEG C, and its element weight percent is C:4.080%, Si:0.350%, Mn:0.550%, S:0.023%, P:0.186%.Then (purity>=99.5% of oxygen, oxygen supply pressure is 0.86MPa, and oxygen flow is 27000m in stove, to be blown into oxygen by converter top oxygen gun
3/ h), be blown into argon gas bottom converter, light a fire successfully, by high hopper first add account for total lime of slag charge 70%, the light dolomite of 23% and 7% grade be 3mm
~5mm, basicity are the high basicity sinter (add-on is 5kg/t) of 2.8, and during blowing 5min, fire door flame feels like jelly, adduction, judges that first slag is formed thus, and by rifle position and slag charge access control, blowing is steadily normal, and slag charge " adds in blowing 8 ' 55.Omnidistance oxygen supply duration of blast reaches 17 ' 10 " after stop blowing, propose rifle deslagging, molten steel flowed in ladle, adds ferro-aluminum, casting molten steel.After finishing blowing, the element weight percent of molten steel is C:0.06%, P:0.015%, and liquid steel temperature is 1650 DEG C.Molten steel amount is 118.43t, and blow loss is 8.9%.
Embodiment 5
Adopt 120t top and bottom combined blown converter blowing Q235B steel grade, steel scrap hot metal charging is more first added in converter, Intake Quantity is 134t, and the temperature of molten iron is 1295 DEG C, and its element weight percent is C:4.170%, Si:0.310%, Mn:0.560%, S:0.018%, P:0.164%.Then (purity>=99.5% of oxygen, oxygen supply pressure is 0.86MPa, and oxygen flow is 27000m in stove, to be blown into oxygen by converter top oxygen gun
3/ h), be blown into nitrogen or argon gas bottom converter, light a fire successfully, by high hopper first add account for total slag charge 68% lime, the light dolomite of 10%, the magnesite ball of 10% and 12% grade be 1mm
~3mm, basicity are the high basicity sinter (add-on is 4kg/t) of 2, and during blowing 4.3min, fire door flame feels like jelly, adduction, judges that first slag is formed thus, and by rifle position and slag charge access control, blowing is steadily normal, and slag charge " adds in blowing 9 ' 55.Omnidistance oxygen supply duration of blast reaches 14 ' 45 " after stop blowing, propose rifle deslagging, molten steel flowed in ladle, adds ferrosilicon, casting molten steel.After finishing blowing, the element weight percent of molten steel is C:0.07%, P:0.021%, and liquid steel temperature is 1654 DEG C.Molten steel amount is 121.94t, and blow loss is 9%.
Test example 1
Sequence number is the converter steel making method using little grade high basicity sinter for " 1 ", and sequence number is " 2 " is the converter steel making method using iron ore, and the smelting situation of two kinds of methods is in table 1.
table 1 uses the smelting situation of different method for making steel
The method for making steel that sequence number is " 1 " has following effect:
(1) because the cooling-down effect of sinter return fine and iron ore is 3:2, so the amount ratio iron ore of sinter return fine is large, more metal charge can be brought, improve the rate of recovery of metal, greatly reduce steelworks steel technology;
(2) FeO Content in Sinter reaches about 9%, and iron ore main component is Fe
2o
3, Fe
3o
4, the tiny body of agglomerate is light, is thus easy to float in slag, and can increase the content of ferric oxide in slag, improve blowingization slag condition, being conducive to slag, the morning 1min of first slag formation time ratio iron ore, early can change slag, be conducive to dephosphorization.
Claims (5)
1. use a converter steel making method for little grade high basicity sinter, comprise the following steps: in converter, add steel scrap, molten iron; Gas is blown into, blowing igniting in stove; Add slag material; Stop blowing; The stove that falls makes molten steel flow in ladle, adds reductor; Casting molten steel, is characterized in that, blowing is lighted a fire successfully, joins in converter by high hopper by slag material, adds in blowing 10min; Described slag material is lime, light dolomite, magnesite ball, high basicity sinter, accounts for 60 ~ 70% of total slag material, 10 ~ 30%, 0 ~ 10% and 7 ~ 16% respectively, and the order added is lime, light dolomite, magnesite ball and high basicity sinter; The grade of high basicity sinter is 3mm ~ 5mm, basicity is 2 ~ 3, FeO content 9%.
2. method according to claim 1, is characterized in that, the described gas be blown in stove is oxygen and nitrogen, or oxygen and argon gas, and oxygen is blown in stove by converter top oxygen gun, and nitrogen or argon gas are blown in stove by gas permeable brick arm bottom converter.
3. method according to claim 1, is characterized in that, the add-on of described high basicity sinter is 4 ~ 12kg/t.
4. method according to claim 1, is characterized in that, when molten steel terminal composition reaches the end point requirements smelting steel grade, when temperature reaches the tapping temperature of this smelting steel grade, stops oxygen blast immediately.
5. method according to claim 1, is characterized in that, described reductor is iron alloy.
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| CN108277317B (en) * | 2017-01-05 | 2019-12-13 | 鞍钢股份有限公司 | method for improving yield of sinter by converter smelting |
| CN113388711A (en) * | 2021-05-31 | 2021-09-14 | 江苏沙钢集团淮钢特钢股份有限公司 | One-time charging smelting method for top-bottom combined blown converter |
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| CN100532618C (en) * | 2007-08-15 | 2009-08-26 | 河南朝阳钢铁有限公司 | Nichrome steel alloy for smelting stainless steel and producing method thereof |
| CN101857911B (en) * | 2010-07-16 | 2012-01-11 | 四川省达州钢铁集团有限责任公司 | Method for steelmaking by using converter |
| CN102965463B (en) * | 2012-11-21 | 2014-05-28 | 首钢总公司 | Efficient dephosphorization process for converter |
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